This Marlin manufactured receiver sight dummy (plug) screw is for the 39-A and 39A lever action rimfire rifle and is mounted on the upper left side of the receiver where a peep sight has the option to mount. This straight slot screw is in very good condition with light slot wear. (file photo)

Note: Marlin model 39-A and 39A lever action rifles with the following serial numbers have been observed with this part:

Marked 39-A: (1947) D7845

Marked 39A: (1951) H24038